AB=
√(Xa-Xb)²+(Ya-Yb)²
AB= √(2- -3)²+(0-0)²
AB= √5²+0²
AB= √25
AB= 5 cm
BC= √(Xb-Xc)²+(Yb-Yc)²
BC= √(-3-0)²+(0-4)²
BC= √3²+4²
BC= √9+16
BC= √25
BC= 5 cm
AC= √(Xa-Xc)²+(Ya-Yc)²
AC= √(2-0)²+(0-4)²
AC= √2²+4²
AC= √4+16
AC= √20
AC= 2√5
Pabc= AB+BC+AC
Pabc= 5+5+2√5
Pabc= 10+2√5